In humans, transmission of nerve impulses across a synaptic cleft is carried out by ________.
a. neurotransmitter molecules
b. potassium ions
c. the nodes of Ranvier
d. sodium ions
Ans: a. neurotransmitter molecules
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Ecologists use compartment models to describe ____
a. grazer food webs b. detrital food webs c. nutrient cycling d. species richness e. inputs of solar energy
Which primates are included within the suborder Prosimii?
a. tarsiers b. monkeys c. monkeys and apes d. lemurs, galagos, and lorises e. monkeys, apes, and humans
When nerve impulses pass to the diaphragm, the diaphragm relaxes and exhalation occurs.
Answer the following statement true (T) or false (F)
Which of the following statements about cranial nerves is not true?
A. Humans have 31 pairs of cranial nerves. B. Some cranial nerves are only sensory nerves, while some are only motor fibers. Others are mixed. C. The vagus nerve is a cranial nerve. D. Cranial nerves are largely associated with the head, neck, and face. E. The cranial nerves are referred to by roman numerals.